Geodesic
A Note on Torsion Free Groups Generated by Pairs of Matrices
Canadian mathematical bulletin, Tome 17 (1975) no. 5, pp. 747-748

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Let and let Gm be the group generated by A and the transpose of A. The problem of determining complex numbers m such that Gm is a free group had been studied by several authors [1, 2, 3]. In this note we characterize those rational values of m for which Gm is torsion free. 
Charnow, A. A Note on Torsion Free Groups Generated by Pairs of Matrices. Canadian mathematical bulletin, Tome 17 (1975) no. 5, pp. 747-748. doi: 10.4153/CMB-1974-134-4
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     title = {A {Note} on {Torsion} {Free} {Groups} {Generated} by {Pairs} of {Matrices}},
     journal = {Canadian mathematical bulletin},
     pages = {747--748},
     year = {1975},
     volume = {17},
     number = {5},
     doi = {10.4153/CMB-1974-134-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-134-4/}
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